The unit in question is Goodman GMV9509050XBA gas furnace (95%% eff.,
90,000 BTU.)
It says in the Installation Instructions (page 7, Location Requirements
& Considerations) that the following must be observed:

"The temperature of the return air entering the furnace is between 55F
and 100F when the furnace is heating."

I am curious why the 55F requirement. I mean, when I'm not in the
house, I would like to set the temp as low as possible in order to save
on my heating bill. I think I could otherwise set it as low as 45-50F
and still keep the water pipes from freezing. But I wonder why I'm not
supposed to go below 55F. What could happen? Could the unit get damaged
and why?

Thanks

P.S. I'm in the Denver, CO area - 5,300 ft altitude, if that matters.

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Hello all,

I work for a midsized Plumbing and Heating outfit in Montreal. We do
mostly service for residential and commercial applications with some
industrial. As far as central controls go, we mostly use off-the-shelf
type products such as Tekmar and the like. We are coming across more
and more plug in applications (pre-programmed controls, that you would
modify paramters on using an end user software).

We would like to get into this end of the business but just dont really
have the exposure. I have heard about the programming languages BacNet
and LonMark and also about a few companies in our area that manufacture
the controls and softwares that go along with them.

I would like to get some advice from someone who works in this end of
the industry. What do you recommend for starters? I was thinking of a
training course for a few of our guys, but what are the things that I
should look for in a course? What is the industry standard? BacNet or
LonMark based? Are all the softwares pretty similar or is there
something that I should be on the lookout for in a training course? Is
it worth it to learn BacNet or LonMark or just become familiar with the
end user softwares?

Howdy everyone,

I've an interesting idea (well hopefully) and secondly I hope this is the
right forum for asking such a question

A family member who lives on an outback farm here in Australia, where there
is no mains electricity, and has a need to cool the house. They have
unlimited space (15,000 hectares of land) and a chain trench digger in the
shed. We are wondering, can a loop be made big enough that brings the water
directly into the house to a radiator/radiators be sufficient to cool a
small house without a refrigerant heat exchanger? House is maybe 120sq
meters (`1290 sq feet) of floor space.

During the wort time of the year air temps are 44 deg c (111 deg f) max
during the day, and 20 deg c (68 deg f) min over night

It all depends on how fast you need to push the IC's and your weight
constraints. Right now the best bet might be to run a plain old freon
refrigerant past the back of the CPU chi

"Robert Baer" earthlink.net> wrote in message
news:lShjh.6103$X72.766@newsread3.news.pas.earthlink.net...
| Skybuck Flying wrote:
|
| > Some questions:
| >
| > 1. How much percentage are synthetic diamonds better at
transferring heat
| > than metals like copper and other metals in todays cooling devices
for
| > computerchips ? A rough percentage estimate is good enough for me.
| >
| > 2. Does it make sense to use synthetic diamonds for cpu coolers or
is there
| > another limiting factor, like maybe the ammount of heat that can
be
| > transfered to the air ?
| >
| > Bye,
| > Skybuck. ...

Some questions:

1. How much percentage are synthetic diamonds better at transferring heat
than metals like copper and other metals in todays cooling devices for
computerchips ? A rough percentage estimate is good enough for me.

2. Does it make sense to use synthetic diamonds for cpu coolers or is there
another limiting factor, like maybe the ammount of heat that can be
transfered to the air ?

Bye,
Skybuck.

I've got a question for the group. I'm a retired Tool & Die
maker/Machinist/gearhead. My Brother is married to a Thai national
who had two kids. The oldest boy (17) is without a doubt the best
natural mechanical talent I have ever seen. This kid should be going
to MIT. The problem is that he doesn't have language skills. He's
having problems graduating from a Detroit area high school. My brother
is planning on retirering to Thailand next year. This kid will be
wasted without the benefit of some kind of formal training. Anybody
know of any kind of mentor program or training program for this guy?
Any other advise? Just as an example, he is the best welder I have
ever seen after three months of high school shop, and I've worked with
many over the years.

I need to know if using a gauge pressure on an ac unit 2 1/2 ton heat
pump is any different then a regular ac unit? And how step by step do
you begin it?